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Portland: An off-duty pilot riding in the extra seat in the cockpit of a passenger jet tried to shut down the engines in mid-flight and had to be subdued by the crew, a pilot flying the plane told air traffic controllers.

Authorities in Oregon identified the man as Joseph David Emerson, 44. He was being held Monday on 83 counts each of attempted murder and reckless endangerment and one count of endangering an aircraft, according to the Multnomah County Sheriff’s Office.

Alaska Airlines is one of the best performing.Credit: iStock

The San Francisco-bound Horizon Air flight on Sunday diverted to Portland, Oregon, where it was met by officers from the Port of Portland, who took Emerson into custody. He was scheduled to be arraigned on Tuesday.

Seattle-based Alaska Airlines, which owns Horizon, a regional carrier, did not name Emerson, but said on Monday that the threat was posed by one of its pilots who was off duty but authorised to occupy the cockpit jump seat.

The airline said in a statement that the captain and co-pilot “quickly responded, engine power was not lost and the crew secured the aircraft without incident.” Alaska said no weapons were involved.

Sunday’s incident occurred on a Horizon Air Embraer 175 carrying 80 passengers, some of them lap children, and four crew members. The plane left Everett, Washington, at 5.23pm local time and landed in Portland an hour later.

One of the pilots told air traffic controllers that the man who posed the threat had been removed from the cockpit.

“We’ve got the guy that tried to shut the engines down out of the cockpit. And he — doesn’t sound like he’s causing any issue in the back right now, and I think he’s subdued,” one of the pilots said on audio captured by LiveATC.net. “Other than that, we want law enforcement as soon as we get on the ground and parked.”

The FBI office in Portland said it was investigating “and can assure the travelling public there is no continuing threat related to this incident.”

The Federal Aviation Administration said it was helping law enforcement investigations, but declined further comment about the incident.

FAA records indicate that Emerson has a valid license to fly airline planes. Property records show that he owns a house in Pleasant Hill, California, about 50 km east of San Francisco. The Associated Press tried to reach his family members but was unsuccessful.

The Multnomah County sheriff’s office, district attorney’s office and public defender’s office did not immediately respond to inquiries about whether Emerson had an attorney to comment on his behalf.

The FAA, in an alert to airlines, said a jump-seat passenger tried to disable the engines by deploying the engine fire-suppression system.

“It is not hard to activate the fire handles — you want them to be accessible in case of an engine fire,” said John Cox, a retired airline pilot and now a safety consultant. He said it is possible to restart the engines once the fire handles are returned to their normal position.

“This is an extremely rare event. In 53 years, I have never heard of a jump-seat rider attempting to shut down engines,” Cox said. He said the third pilot can be invaluable in cases where a crew must deal with a complex situation.

Jeffrey Price, an aviation-security expert at Metropolitan University of Denver, said airlines must approve people who sit in the jump seat, but the pilots working the flight can deny access.

The vetting of crew members is based on trust, he said, and the last line of defence is what happened on the Horizon plane — “crew members physically preventing someone from taking over the flight controls. The system worked, fortunately.”

In 2018, a pilot in the jump seat of a Boeing 737 Max operated by Indonesia’s Lion Air emerged as a hero after helping the crew stop the plane’s nose from repeatedly pointing down. Disaster was averted- — or delayed until the next flight of the plane, which crashed, killing all 189 people on board.

There have been crashes that investigators believe were deliberately caused by pilots. Authorities said the co-pilot of a Germanwings jet that crashed in the French Alps in 2015 had practiced putting the plane into a dive.

In 2018, a Horizon Air ground agent stole an empty plane at Sea-Tac International Airport in Seattle and crashed into a small island in Puget Sound after being chased by military jets that scrambled to intercept the plane. The man told an air traffic controller that he “wasn’t really planning on landing” the aircraft, and described himself as “a broken guy.”

Alaska said passengers continued on to San Francisco on a later flight.

AP

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